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Ovulation

Ovulation Calculator

Estimate your ovulation date and fertile window for cycle awareness or trying to conceive.

Cycle information

Your ovulation and fertile window estimate will appear here.
Estimated ovulation
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Fertile start
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Fertile end
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Next period
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Test reference

Calculation Method and FAQ

Ovulation is estimated as about 14 days before the next period. The fertile window is estimated from 5 days before ovulation through 1 day after ovulation.

FAQ

Related reading

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Note: Ovulation can shift because of stress, illness, sleep, medication, and cycle variation. This estimate is not a contraception method.